Other contributors have said "How does the kneecap help you?" is the same question as "What is the function of the kneecap?" If you believe that these are not asking the same thing and should be answered differently, click here
Here is an example for a variable, which is a function (function-pointer, actually): int (*myfun)(const char *s); myfun = puts; myfun ("Hello, world");
The average of a set of numbers is equal to the sum of those numbers divided by the number of numbers. So, one might say that the average function is equal to the sum function divided by the count...